Does Madison, WI have its own flood zones ordinance?

No. Madison, WI does not appear to have a local flood zones ordinance, Wisconsin state law applies instead. The rules summarized on this page come from WI NR 116 Floodplain Management.

Key Facts Ordinance Text Full Breakdown Violations FAQ Sources More in Madison

Madison, WI Environmental Rules: Flood Zones (2026)

Significant Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

FEMA flood zone rules in Madison, WI, also called floodplain regulations or special flood hazard area (SFHA) rules, determine flood insurance requirements and elevation standards for new construction.

Key Facts

Permit required: Zoning certificate before any floodplain development
Issuing office: Zoning Administrator, Madison Municipal Building
Districts regulated: Floodway, Floodfringe, General Floodplain, Flood Storage
Floodway habitable structures: Prohibited outright
Penalty: Up to $50/day forfeiture plus costs
Appeal body: Zoning Board of Appeals

FEMA Flood Zone Lookup

FEMA assigns every parcel in the U.S. a flood-hazard designation on its Flood Insurance Rate Maps (FIRMs). Zones starting with A or V are high-risk Special Flood Hazard Areas where federally backed mortgages require NFIP flood insurance. Zone X indicates moderate-to-minimal risk, where insurance is optional but often recommended. Your specific zone determines insurance cost, build elevation, and permit requirements in Madison, WI.

Zone	What it means	NFIP required?
A	High-risk flood area; 1% annual chance flood, no detailed analysis.	Yes
AE	High-risk; same as A but with established Base Flood Elevations.	Yes
AH	High-risk shallow flooding (1-3 ft), usually ponding.	Yes
AO	High-risk shallow flooding (1-3 ft) with sheet flow on sloping terrain.	Yes
V	High-risk coastal zone subject to wave action (no BFE).	Yes
VE	High-risk coastal zone with wave action and established BFEs.	Yes
X (shaded)	Moderate risk; between the 1% and 0.2% annual chance flood.	Recommended
X	Minimal risk; outside the 0.2% annual chance floodplain.	No

Look up Madison, WI on the FEMA flood map

FEMA maps update periodically; verify zone before buying flood insurance or building.

Summary

Any structure, fill, or land-use change within Madison's mapped floodplain needs a zoning certificate from the Zoning Administrator before work starts, per Madison General Ordinances § 21.23(2). Chapter 21 divides the flood hazard area into Floodway, Floodfringe, General Floodplain, and Flood Storage Districts, each carrying its own permitted-use list and construction standards.

(a)No structure or use within areas regulated by this ordinance shall hereafter be located, erected, constructed, reconstructed, repaired, extended, converted, enlarged, or altered without full compliance with the terms of these regulations and all other applicable regulations that apply to uses within the jurisdiction of these regulations.(b)Failure to obtain a floodplain development zoning certificates shall be a violation of these regulations and shall be punishable in accordance with subsection 21.32. ... A zoning certificate shall be obtained before any development; repair, modification, or addition to an existing structure; or change in the use of a building or structure, including sewer and water facilities, may be initiated in the floodplain.

Source: WI NR 116 Floodplain ManagementView official code

Full Breakdown

23(2) requires a zoning certificate before any development, repair, modification, addition, or change in the use of a building or structure, including sewer and water facilities, is initiated within the floodplain, with the application covering site plans, lot elevations, distances from lot lines, and existing or proposed sewage and water systems. 05(6)(a) bars locating, erecting, constructing, reconstructing, repairing, extending, converting, enlarging, or altering any structure or use in the regulated area without full compliance with the ordinance. 13. 17. 19. 05(12). 26, and any map change needs DNR and FEMA sign-off.

Violations & Fines

Failure to obtain a floodplain development zoning certificate is itself a violation under § 21.05(6)(b), punishable per § 21.32 with a forfeiture of not more than $50 plus taxable costs, with each day of continued violation a separate offense; every violation is also deemed a public nuisance the City, state, or any citizen may sue to abate under Wis. Stat. § 87.30.

Frequently Asked Questions

Do I need a permit to build in a Madison floodplain?

Yes, § 21.23(2) requires a zoning certificate from the Zoning Administrator before any development, repair, modification, addition, or use change begins on property in a mapped Special Flood Hazard Area, including installation of sewer and water facilities.

Can I build a house in Madison's Floodway District?

No, § 21.14 prohibits habitable structures and anything with high flood damage potential in the Floodway District; only open-space uses like farming, parks, and non-structural recreation are allowed, subject to a no-rise engineering analysis under § 21.13.

What happens if I develop in the floodplain without a permit?

Under §§ 21.05(6)(b) and 21.32, it's a violation punishable by a forfeiture of up to $50 per day plus taxable costs, and the City, the state, or any citizen can sue to enjoin or abate the unpermitted work as a public nuisance.

Who decides floodplain zoning disputes in Madison?

The Zoning Board of Appeals hears variance requests and boundary disputes under §§ 21.25 and 21.05(4); its decisions on floodway or floodfringe boundaries can be further appealed under the process set out in § 21.26.

Sources & Official References

[1]Madison General Ordinances, Ch. 21 – Floodplain Zoning Ordinance

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All Madison rules

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